阅读下列短文，从每小题的三个选项中选出最佳答案

      It is morning now. Look at the sun, it rises in the east(东方). Look at the tree, the shadow is long. It is noon now. The sun is high in the sky. It is very hot. Look at the tree. The shadow is short. It is evening now. The sun goes down in the west(西方). Look at the tree, the shadow is long again. It is night now. The moon is high in the sky. There are some stars in the sky too.

结合提示，完成下面题目：

提示：香甜的瓜汁、可口的果茶、清爽的冷饮……随着夏天的来临，各种自制饮料的销售开始火爆。但是，经检验，部分自制饮料中存在着对人体有害的添加剂。

读图1、图2，回答下列问题。

若2a+3b=10，其中a≥0，b≥0，又P=5a+3b，求P的取值范围．